KnowraFirst law of thermodynamicsLinked fromLinked fromThe 53 pages that link to First law of thermodynamics, each with the reason it gives.All 53Broader topic 2Related 33Narrower topic 14Compared with 4Gibbs free energyNarrower topic: It underlies the energy accounting from which enthalpy and Gibbs free energy are constructed.EnthalpyNarrower topic: It relates enthalpy changes to heat while accounting for work.CalorimetryNarrower topic: Calorimetric heat measurements apply energy conservation to the sample and its surroundings.Joule–Thomson effectNarrower topic: It explains how an insulated throttle can preserve enthalpy despite a pressure drop.Chemical thermodynamicsNarrower topic: It constrains the heat and work exchanged during chemical changes.Otto cycleNarrower topic: It accounts for the heat and work exchanged during each cycle process.James Prescott JouleNarrower topic: Joule’s measurements helped establish the law’s equivalence of heat and work.Refrigeration cycleNarrower topic: It accounts for heat removed, heat rejected, and work supplied across the cycle.Fundamental thermodynamic relationNarrower topic: The relation gives the first law a state-variable form for reversible changes.Gibbs–Helmholtz equationNarrower topic: It underlies the energy accounting that defines enthalpy.ThermochemistryNarrower topic: It constrains the heat and work accompanying every thermochemical process.Endothermic processNarrower topic: Absorbed heat changes the system’s energy rather than creating energy.Exothermic processNarrower topic: It explains how released heat fits into the system’s overall energy balance.Heat pump and refrigeration cycleNarrower topic: It accounts for heat delivered as the sum of extracted heat and compressor work.